The connotation of Duan Zi's ideal plumber

This is an interesting joke. Let me explain.

The original text of the joke is: "My son's ideal job is a plumber. I asked him why, and he said,' Plumbers can whistle while working, clean and happy.' "

The joke means that my son wants to be a plumber, because plumbers can whistle at work, which is both happy and clean. This joke, through his son's language and behavior, expresses his yearning and understanding of the profession of plumber, and also expresses people's views and feelings about different professions.

Generally speaking, this joke expresses people's attitude towards career choice and work in a relaxed and humorous way.